Examine source code of CSS Reload

{
  "manifest_version": 3,
  "version": "0.3.9",
  "name": "__MSG_title__",
  "description": "__MSG_description__",
  "homepage_url": "https://github.com/StoyanDimitrov/css-reload",
  "icons": {
    "32": "assets/icon.svg",
    "48": "assets/icon.svg",
    "96": "assets/icon.svg"
  },
  "background": {
    "scripts": [
      "assets/internal-state.js",
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": "assets/icon.svg",
    "default_title": "__MSG_pageActionTitle__",
    "pinned": true
  },
  "commands": {
    "reload-css": {
      "suggested_key": {
        "default": "Ctrl+F9"
      },
      "description": "__MSG_hotKeyName__"
    }
  },
  "options_ui": {
    "page": "assets/options.html"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d886e5fc-f10b-4cd4-ac3e-4a5b89927827}"
    }
  },
  "default_locale": "en"
}